Helen Maria Bayly was the second youngest of sixteen children of Henry O'Neale Bayley (1757–1826) and Anne Penelope Bayley nee Grueber (1762–1837).
Helen Bayly married William Rowan Hamilton (1805–1865) on 9 April 1833 at Ballinaclough, Ireland. The marriage was announced in the Belfast Newsletter of 16 April 1833:
They had three children:
"The lady whom Hamilton married in the year 1833 was a daughter of the Rev. Henry Bayly, Rector of Nenagh, in the county of Tipperary, a member of the family whose head is settled at Debsborough in that county : she was in this way connected with Lord Dunalley and with Dean Head, Dean of Killaloe, who were neighbours in the country, took an interest in the marriage, and were subsequently Hamilton's acquaintances and correspondents. Miss Bayly's mother, whose maiden name was Grueber, and who by her letters appears to have possessed a bright mind and amiable disposition, was at this time a widow and resided at Bayly Farm, near Nenagh. She (Anne Grueber) had many children, two of whom were married to brothers, Mr. William and Mr. Henry Rathborne, whose country-houses, Scripplestown and Dunsinea, were in immediate neighbourhood to the Observatory. With the elder of these sisters, Mrs. William Rathborne of Scripplestown, Helen Bayly was often a guest."[3]
"The Bayly family was a large, influential and prosperous land owning family. Helen Bayly was a great great granddaughter of the Ven. Benjamin Neale (1678-1733), Archdeacon of Leighlin. Some of the inmarried wives were heirs, such as Deborah Neale (1702-1777), Helen's great grandmother, who was coheir of her father Benjamin Neale, and Catherine Crosbie, the wife of her uncle John Bayly, who was coheir of her father Lancelot Crosbie, and inherited the estates of her uncle John Crosbie. Furthermore, Hamilton's biographer Robert Perceval Graves mentioned that Helen Bayly was 'connected with Lord Dunalley [Henry Prittie (1775-1854)] and with Dean [John] Head [(ca 1790-1871)], Dean of Killaloe, who were neighbours in the country, took an interest in the marriage, and were subsequently Hamilton's acquaintances and correspondents.' "[4]
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